SSE-Engineer Prisma Access Troubleshooting Practice Question
A remote network connected via Prisma Access is experiencing packet drops due to Maximum Transmission Unit (MTU) size mismatches. Which troubleshooting technique or configuration should be verified to resolve IP packet fragmentation issues?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable TCP MSS clamping on the IPsec tunnel settings or ensure the local CPE device correctly handles ICMP Destination Unreachable messages.
Path MTU Discovery and MSS clamping configurations on the IPsec tunnel help prevent packet fragmentation issues across Prisma Access tunnels.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Change the mobile user authentication type from SAML to RADIUS.
Why it's wrong here
Authentication methods have no impact on network packet size or MTU matching.
- ✓
Enable TCP MSS clamping on the IPsec tunnel settings or ensure the local CPE device correctly handles ICMP Destination Unreachable messages.
Why this is correct
Adjusting TCP Maximum Segment Size (MSS) prevents packets from exceeding the tunnel MTU, avoiding fragmentation drops.
- ✗
Configure a WildFire analysis profile to bypass large files.
Why it's wrong here
WildFire file size limits do not affect network layer MTU drops.
- ✗
Increase the GlobalProtect client idle timeout value to 3600 seconds.
Why it's wrong here
Idle timeouts govern session aging, not packet MTU size or fragmentation.
Visual reference
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
About these practice questions
Courseiva writes every SSE-Engineer question from scratch — 203 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Palo Alto Networks exam blueprint
This SSE-Engineer practice question is part of Courseiva's free Palo Alto Networks certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SSE-Engineer exam.